Swedish birthday song

This is the song used at birthdays in Sweden. It is thought to
date back to the 18th century, though the composer is unknown.
The words and melody have changed somewhat over time. The
song first appeared with the current lyrics in a songbook
published in 1914, when it was used as a drinking song.
Since 1940 is has been used as a birthday song.

Versions of this tune are also found in Austria, Germany and
the Netherlands, though with different words.